On Thu, Jul 13, 2017 at 8:39 PM, <b...@zq3q.org> wrote:
> Hi Bob:
>
> These examples help! Thank you.
>
> On Thu 7/13/17 15:53 -0400 Bob Harold wrote:
> > Let's illustrate one NS record, for each of the cases:
> > (I think your case is #2)
> >
> > 1. Name server name inside the domain itself
> >
> > example.com zone:
> > example.com IN NS ns.example.com
> > ns.example.com IN A x.x.x.x
> >
> > the TLD com would have (entered by the registrar)
> > example.com IN NS ns.example.com
> > ns.example.com IN A x.x.x.x (this is a "glue" record)
>
> OK. This example is the most commonly seen in web searches.
>
> > 2. Name server name in another domain:
> >
> > example.com zone:
> > example.com IN NS ns.otherdomain.com
> >
> > TLD com zone:
> > example.com IN NS ns.otherdomain.com
> > (no glue record)
>
> Exactly one delegation NS record.
>
> Several have made that clear; ie I now clearly understand there is
> *not* another NS delegation record needed in the zone with the $ORIGIN
> that is part of the ("non vanity") nameserver's FQDN.
>
> > otherdomain.com zone:
> > ns.otherdomain.com IN A x.x.x.x
>
> Almost goes without saying that above A record is needed.
>
> > 3. Sibling domains with name servers for each other: (should be avoided?)
> >
> > example.com zone:
> > example.com IN NS ns.otherdomain.com
> > ns.example.com IN A x.x.x.x
> >
> > otherdomain.com zone:
> > otherdomain.com IN NS ns.example.com
> > ns.otherdomain.com IN A x.x.x.x
> >
> > TLD com zone:
> > example.com IN NS ns.otherdomain.com
> > ns.example.com IN A x.x.x.x (glue record?)
> > ns.otherdomain.com IN A x.x.x.x (glue record?)
>
> Interesting. I think the glue record make sense.
> I'm not planning to do this. :->
>
> I do not see any delegation NS record for otherdomain.com above.
> Is this right?:
>
> TLD com zone:
> example.com IN NS ns.otherdomain.com
> ns.example.com IN A x.x.x.x (glue record?)
> otherdomain.com IN NS ns.example.com
> ns.otherdomain.com IN A x.x.x.x (glue record?)
>
> --
> thanks,
> Tom
>
You are correct, the TLD needs the records that you show.
And as others have said, there should be at least 2 or 3 name servers for
every zone, and they should be on different networks. I was trying to show
the various cases that apply to each *one* of the NS and glue records.
--
Bob Harold
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